EP2113927B1 - Ruban à ré-embobinage semi-conducteur sur la base de polytétrafluoréthylène - Google Patents

Ruban à ré-embobinage semi-conducteur sur la base de polytétrafluoréthylène Download PDF

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Publication number
EP2113927B1
EP2113927B1 EP09004145.0A EP09004145A EP2113927B1 EP 2113927 B1 EP2113927 B1 EP 2113927B1 EP 09004145 A EP09004145 A EP 09004145A EP 2113927 B1 EP2113927 B1 EP 2113927B1
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EP
European Patent Office
Prior art keywords
winding
tape
winding tape
polytetrafluoroethylene
conductive
Prior art date
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Active
Application number
EP09004145.0A
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German (de)
English (en)
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EP2113927A1 (fr
EP2113927B9 (fr
Inventor
Wolfgang Dlugas
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
HEW Kabel GmbH and Co KG
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HEW Kabel GmbH and Co KG
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B3/00—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties
    • H01B3/18—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances
    • H01B3/30—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances plastics; resins; waxes
    • H01B3/44—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances plastics; resins; waxes vinyl resins; acrylic resins
    • H01B3/443—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances plastics; resins; waxes vinyl resins; acrylic resins from vinylhalogenides or other halogenoethylenic compounds
    • H01B3/445—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances plastics; resins; waxes vinyl resins; acrylic resins from vinylhalogenides or other halogenoethylenic compounds from vinylfluorides or other fluoroethylenic compounds

Definitions

  • the present invention is a non-sintered winding tape consisting of polytetrafluoroethylene with a plano-convex cross-sectional shape, which is determined by a curved upper and a substantially straight lower boundary line, for the production of compact or at least after a partial sintering of the strip material of the winding layers self-supporting sheaths for electrical cables and lines ,
  • the invention has the object to develop the known as insulating tapes in the field of electrical cables and lines new applications.
  • This object is achieved according to the invention in that the unsintered winding tape contains in powder form present polytetrafluoroethylene, lubricants or lubricants and conductive fillers for forming a semiconductive winding tape.
  • the object is further achieved for an electrical coaxial cable with a semiconducting compact, optionally self-supporting shell in the layer structure, produced using such unsintered winding tape.
  • polytetrafluoroethylene also includes tetrafluoroethylene polymers which are provided with modifying additives, but in such an amount that
  • the polymer such as the polytetrafluoroethylene itself, is not processable from the melt.
  • polytetrafluoroethylene with conductive fillers, such as metal powder, carbon black, silicon, graphite or similar substances having a suitable conductivity.
  • conductive fillers such as metal powder, carbon black, silicon, graphite or similar substances having a suitable conductivity.
  • the modified polytetrafluoroethylene in contrast to the invention is used in electric hotplates ( GB 2 407 747A ), electromagnetic shielding of electronic equipment ( EP 0 860 834 A2 ), in diffusion membranes ( US 2005/0173244 A1 ) or mechanical sliding bearings for buildings and bridges in earthquake-prone areas ( US 6,289,640B1 ).
  • the same or similar fillers are also used as flame retardants for the insulation of electrical cables, but as an insulating material from the invention melt-deformable fluoropolymers are used.
  • conductive fillers have also been added to the powdered polytetrafluoroethylene and strips have been produced by a so-called paste extrusion with subsequent rolling of the preform with a one-sided or double-sided surface conductivity ( WO 2006/117679 A2 ).
  • These bands which also have a rectangular cross-sectional shape are used in the sintered state of the strip material, for example, as a shield in electrical cables.
  • the rectangular shape of the known, for a shield already already sintered bands leads in the overlap region of the band edges to unavoidable air inclusions in the winding body, a uniform current distribution over the cross section in the axial direction of the cable or across, can not be achieved.
  • discontinuities occur in the region of the overlapping strip edges, which in combination with the air inclusions in the interior do not allow an optimal shielding effect or uniform current distribution in the conductive tape roll itself.
  • the proportion of conductive fillers in the polytetrafluoroethylene powder is from 1.5 to 30% by weight, preferably from 2 to 20% by weight. This results in advantageous surface resistances of the inventive unsintered winding tapes of 10 ohms / mm 2 to 10 MOhm / mm 2 .
  • a band thickness of 20 to 200 .mu.m, preferably 40 to 160 .mu.m is essential for a good shielding action of winding diapers, the band thickness decreasing to 5 .mu.m and less towards the band edges or towards the edge of the band.
  • the width of the band according to the invention should be 5 to 50 mm, preferably 10 to 30 mm.
  • the shielding of an electric field achieved by the invention is effective over a wide temperature range of -100 ° C to + 200 ° C and even above.
  • a winding consisting of the winding tape according to the invention finds an advantageous application in the area of coaxial high-frequency cables.
  • the insulation materials used in the layer structure of such cables for transmitting high-frequency signals, low or high melting polymers one will form the winding tape according to the invention as a compact winding body or after a partial or complete sintering of the strip material between 300 and 400 ° C to a self-supporting shell to shape.
  • Heating cable of the type mentioned which have also found under the name Schu fringen or heating tapes input into the art are used for many years, for example, as so-called.
  • RohrbegleitMaponne to prevent freezing of the conveyed in the pipes media or to ensure that the media keep the required for their transport own temperatures.
  • Also for steam-purged pipes or piping systems provide so-called.
  • Heat tracing for the temperature maintenance or for an increase in temperature.
  • the heating of piping systems is also a problem in aircraft construction, where it is important to ensure adequate frost protection for the water pipes in the aircraft when the aircraft is exposed to extreme outside temperatures on long flights.
  • the invention offers the possibility to improve the thermal load capacity of known heating elements and, above all, to ensure that the heating cable, the heating cable or the heating cable is not damaged or destroyed by short-term temperature overload. This leads to a considerable increase in energy consumption Operational safety of heating cables with heating conductors made of semiconducting plastics.
  • the electrical conductors can be performed parallel to each other in the heating cable according to the invention. This is particularly advantageous when a flat heating cable is required for certain applications, such as for the pipe trace heating, so the heating cable so rather has the shape of a band.
  • Another advantageous embodiment of the invention is when the electrical conductors are stranded together in the heating cable. Thus, this embodiment corresponds more to today's conventional heating cables with a central electrical resistance heating conductor in a coaxial design.
  • the heat generating semiconducting, still unsintered PTFE tape is in one or more layers about each of the.
  • Power supply provided uninsulated electrical conductor, the so-called. PTC thermistor, wound around so that the uppermost layers of the PTFE winding of the adjacent adjacent parallel or stranded conductors contact each other.
  • PTC thermistor wound around so that the uppermost layers of the PTFE winding of the adjacent adjacent parallel or stranded conductors contact each other.
  • the individual conductors wound with the semiconducting tape made of polytetrafluoroethylene additionally are surrounded by a winding common to all conductors from the semiconducting tape according to the invention.
  • a particularly smooth, self-contained surface of the semiconductive winding results.
  • the electrical properties of the polymer matrix according to the invention corresponds at least to those of known heating cables, but compared to this it has a much higher heat resistance, ie, it is higher current-carrying and also easily withstands short-term temperature overloads.
  • the winding of the semiconducting PTFE tape surrounded by a protective conductor in the form of stranded or - plaited metallic wires is covered by an outer jacket in the form of a winding made of an insulating PTFE tape, which is likewise subjected to a sintering process following the winding process.
  • the winding tape to achieve the desired quality features on a special, namely a plano-convex cross-sectional shape.
  • a cross-sectional shape requires that it has a reinforced central region that slopes down to either side, i.e., towards the band edges, to a minimum ribbon thickness.
  • the secure bonding or welding of the individual strip layers during the sintering process, including the extremely thin strip edges, also results in a substantial increase in bending fatigue strength. This applies to both the semiconducting and the known insulating PTFE tapes according to the invention, which are used in the heating cable according to the invention.
  • the semiconducting properties of the polytetrafluoroethylene winding tape used in the invention for producing a semiconductive polymer matrix or for producing semiconductive compact tape windings are achieved by the conductive fillers mentioned, such as carbon black, graphite, metal oxides and the like, which according to another inventive concept together with the PTFE powder and the usual lubricants or lubricants and pressed into a cylindrical blank. Subsequently, this blank is expedient pressed to a strand of smaller external dimensions, such as a round cord, and finally rolled in the mold gap of a pair of rollers to form a strip, wherein the surface of at least one roller is deformed during the Auswalzens the round cord to the conductive band under pressure.
  • the conductive fillers mentioned such as carbon black, graphite, metal oxides and the like
  • the pressure load of the conductive round cord takes place in the radial direction in such a way that the material quantity of polytetrafluoroethylene powder, lubricant or lubricant and conductive fillers remaining in the pressure-loaded middle region of the round cord is greater than the amount of material remaining toward the band edges.
  • This type of forming a round cord to the winding tape according to the invention avoids the disadvantageous orientation of the material particles in only one direction.
  • the invention is based on the in the FIGS. 1 and 2 illustrated embodiments explained in more detail. It shows the Fig.1 a flat heating cable in which two live uninsulated electrical conductors are embedded in a semiconductive polymer matrix, while in the Fig.2 a particularly low-noise electrical coaxial high-frequency cable is shown as an embodiment of the invention.
  • the conductors 1 are each enclosed by a winding 2 of the unsintered, by a carbon black content of, for example 5% semiconducting PTFE tapes with the plano-convex cross-sectional shape, which applied in the unsintered state of the strip material on the conductor 1, preferably with overlap, for example up to 50% , And sintered in the wound state by an appropriate temperature treatment at about 350 ° C - 400 ° C.
  • the wire pair consisting of the two adjacent conductors 1 is designated 3, the current-carrying conductors 1 are electrically conductively connected to one another via their respective windings 2.
  • the wire pair 3 with a further winding 4 also from the semiconducting PTFE tapes special cross-sectional shape provided so results after a sintering process and thereby taking place shrinkage of the strip material, a compact matrix of the windings 2 and 4 of semiconductive polytetrafluoroethylene, in which the two current-carrying conductors 1 are embedded.
  • band winding 5 made of an insulating PTFE tape, which in turn is applied in the unsintered state and subjected as a wound layer to a sintering process with appropriate temperature treatment, so that the individual tape layers weld to a compact insulation.
  • the protective conductor prescribed in such heating cables for safety reasons is designated 6, it consists in obtaining a substantial, circumferentially extending covering of a plurality of individual copper wires, e.g. To avoid corrosion are additionally coated with a suitable metallic material.
  • the outer jacket 7 of the heating cable according to the invention consists of a winding of insulating PTFE tapes, which are first applied to the protective conductor 6 in an unsintered state for compacting the individual tape turns or layers and to achieve a closed and smooth surface, before the PTFE material of the tapes subjected to a sintering process.
  • the heating cable according to the invention can be used without problems for a temperature range of -190 ° C to + 260 ° C.
  • the heating cable according to the invention allows short-term temperature overloads, without short circuits in the cable due to melting polymer material being feared.
  • This heating cable has a high mechanical strength and a high cold resistance, in addition, it is stable even at high operating temperatures.
  • the operating voltage of this heating cable is 600 V.
  • a coaxial high-frequency cable with a maximum outer diameter of only 3.2 mm
  • the existing example of copper inner conductor 8 may be solid, but it may also consist of a plurality of stranded individual conductors, such as silver-plated or galvanized copper wires exist. This is particularly advantageous if a high flexibility of the cable is required. Because of the possible use of the cable constructed according to the invention in one Temperature range between -100 ° C and +200 ° C, the insulation 9 is made of a fluoropolymer.
  • This may be a melt-processable fluoropolymer, eg, a tetrafluoroethylene-perfluoroalkyl vinyl ether copolymer (TFA / PFA), a tetrafluoroethylene-hexafluoropropylene copolymer (FEP), or even a polytetrafluoroethylene-perfluoromethyl vinyl ether (MFA) or other suitable known meltable fluoropolymer.
  • FFA tetrafluoroethylene-perfluoroalkyl vinyl ether copolymer
  • FEP tetrafluoroethylene-hexafluoropropylene copolymer
  • MFA polytetrafluoroethylene-perfluoromethyl vinyl ether
  • the insulation 9 is covered by a winding 10 of the semiconductive winding tape of polytetrafluoroethylene according to the invention, which contains 15% conductive fillers in the embodiment.
  • This winding 10 is crucial for the reduction of the noise voltage of this high-frequency cable, the winding 10 is covered by a first braid 11 of metallic wires, such as silver-plated copper wires.
  • Intermediate jacket it consists of a layer of one of the melt processable fluoropolymer, for example from a FEP.
  • This intermediate casing 13 is enclosed by a second braid 14, which in the exemplary embodiment is constructed like the braid 11.
  • the cable shown is protected to the outside by the jacket 15, for example, again from a tetrafluoroethylene / hexafluoropropylene copolymer (FEP).
  • FEP tetrafluoroethylene / hexafluoropropylene copolymer
  • the winding 10 directly surrounds the inner conductor 8 or is arranged so that it contacts the braid 11 and or 14.
  • the equipped with the semiconductive winding tape according to the invention coaxial high-frequency cable is characterized by an extremely uniform over the cable length characteristic impedance of 50 ohms at 20 ° C and excellent noise properties.
  • the reduction of the noise voltage is due to the fact that the use of the semiconductive winding band with its plano-convex cross-sectional shape ensures a compact sheath (10), which experiences no diameter fluctuations over the cable length with a smooth and closed, practically bum-free surface in the region of the overlapping band edges.

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  • Physics & Mathematics (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • Insulated Conductors (AREA)

Claims (9)

  1. Bande d'enroulement non frittée constituée de polytétrafluoroéthylène, présentant une forme de section transversale plane convexe, qui présente une zone centrale renforcée, dont l'épaisseur se réduit à une épaisseur de bande minimale à plat en direction des arêtes de bande, servant à fabriquer des gaines, compactes ou autoportantes au moins après un frittage partiel du matériau de bande des couches d'enroulement, pour des câbles électriques,
    dans laquelle
    la bande d'enroulement non frittée contient du polytétrafluoroéthylène sous forme de poudre, des agents de lubrification ou de glissement et des charges conductrices, afin de réaliser une bande d'enroulement semi-conductrice.
  2. Bande d'enroulement selon la revendication 1, caractérisée en ce que la proportion des charges conductrices dans la poudre de polytétrafluoroéthylène va de 1,5 à 30 % en poids, de préférence de 2 à 20 % en poids.
  3. Bande d'enroulement selon la revendication 1 ou 2, caractérisée en ce que la résistance de surface de la bande d'enroulement en polytétrafluoroéthylène non frittée semi-conductrice par les charges va de 10 Ohm/mm2 à 10 MOhm/mm2.
  4. Bande d'enroulement selon la revendication 1 ou selon l'une quelconque des revendications qui suivent, caractérisée en ce que l'épaisseur de bande va de 20 à 200 µm, de préférence de 40 à 160 µm, dans laquelle l'épaisseur de bande en direction des arêtes (bord) diminue de manière à s'établir à 5 µm et moins.
  5. Bande d'enroulement selon la revendication 1 ou selon l'une quelconque des revendications qui suivent, caractérisée en ce que la largeur de la bande d'enroulement présente une valeur allant de 5 à 50 mm, de préférence de 10 à 30 mm.
  6. Câble coaxial électrique comprenant une gaine compacte semi-conductrice, éventuellement autoportante, présentant une structure stratifiée, fabriquée en utilisant une bande d'enroulement non frittée selon l'une quelconque des revendications précédentes.
  7. Câble coaxial électrique selon la revendication 6, caractérisé en ce que la gaine compacte, éventuellement autoportante, renferme l'isolation du conducteur intérieur du câble coaxial.
  8. Câble coaxial électrique selon la revendication 6, caractérisé en ce que la gaine compacte, éventuellement autoportante, renferme directement le conducteur intérieur d'un câble coaxial.
  9. Câble coaxial électrique selon la revendication 7, caractérisé en ce que l'isolation du conducteur intérieur est constituée d'un polymère fluoré pouvant être travaillé à partir de la matière fondue.
EP09004145.0A 2008-04-28 2009-03-24 Ruban à ré-embobinage semi-conducteur sur la base de polytétrafluoréthylène Active EP2113927B9 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE200810021204 DE102008021204A1 (de) 2008-04-28 2008-04-28 Halbleitendes Wickelband aus Polytetrafluorethylen

Publications (3)

Publication Number Publication Date
EP2113927A1 EP2113927A1 (fr) 2009-11-04
EP2113927B1 true EP2113927B1 (fr) 2017-03-01
EP2113927B9 EP2113927B9 (fr) 2017-06-14

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP09004145.0A Active EP2113927B9 (fr) 2008-04-28 2009-03-24 Ruban à ré-embobinage semi-conducteur sur la base de polytétrafluoréthylène

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EP (1) EP2113927B9 (fr)
DE (1) DE102008021204A1 (fr)

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20160055939A1 (en) * 2014-08-19 2016-02-25 Nexans Arrangement and construction for airframe wires
WO2016130576A1 (fr) 2015-02-09 2016-08-18 Pentair Thermal Management Llc Câble chauffant ayant un profil à section décroissante
EP3455537B1 (fr) 2016-05-10 2022-03-16 Nvent Services Gmbh Fil blindé pour chauffage de traçage à effet pelliculaire à haute tension
US11006484B2 (en) 2016-05-10 2021-05-11 Nvent Services Gmbh Shielded fluoropolymer wire for high temperature skin effect trace heating
DE102016224415A1 (de) 2016-12-08 2018-06-14 Leoni Kabel Gmbh Leitung und Verfahren zur Herstellung einer solchen
CN106918744B (zh) * 2017-03-27 2019-10-11 北京国电富通科技发展有限责任公司 一种污秽绝缘子局部表面电阻的测量方法
CN107613593A (zh) * 2017-10-31 2018-01-19 山东华宁电伴热科技有限公司 一种自控温电热带
CN113783053A (zh) * 2021-09-01 2021-12-10 中联通服(北京)通讯技术有限公司 一种超扁hdmi智能眼镜连接线

Family Cites Families (7)

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Publication number Priority date Publication date Assignee Title
DE3214447C2 (de) 1982-04-20 1994-05-11 Eilentropp Hew Kabel Ungesintertes Wickelband des Polytetrafluorethylen
US6210789B1 (en) 1997-02-20 2001-04-03 W. L. Gore & Associates, Inc. Electrically conductive composite article
US6289640B1 (en) 1999-07-09 2001-09-18 Nippon Pillar Packing Co., Ltd. Seismic isolation sliding support bearing system
JP4215979B2 (ja) 2001-12-17 2009-01-28 日本バルカー工業株式会社 拡散膜、該拡散膜を有する電極および拡散膜の製造方法
GB2407747A (en) 2003-10-31 2005-05-04 Ceramaspeed Ltd Wall for an electric heater and process for the production thereof
US7481952B2 (en) 2004-04-29 2009-01-27 Compagnie Plastic Omnium Electrically conductive PTFE tape
US7625974B2 (en) * 2005-09-30 2009-12-01 Alphagary Corporation Highly filled unsaturated fluoropolymer compositions for cables

Non-Patent Citations (1)

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Publication number Publication date
EP2113927A1 (fr) 2009-11-04
EP2113927B9 (fr) 2017-06-14
DE102008021204A1 (de) 2009-11-05

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